He has been a rabble-rousing Roman poet and a choreographer struggling with a recalcitrant young ballerina, a doctor battling encroaching age and hospital bureaucracy and a Nazi saboteur hanging from the Statue of Liberty by his fingernails. If you know who he is, you are a serious student of film history. If not, then you may ask – as the title of the new documentary opening on Nov. 23 bluntly puts it — “Who Is Norman Lloyd?”